The hit crime drama starring Nicola Walker and Sanjeev Bhaskar will return to our screens to solve another historic murder later this year.

Fans of hit crime drama Unforgotten will be thrilled to hear that series four is now in production, hopefully bringing a new cold case for detectives Cassie Stuart and Sunil 'Sunny' Khan (played by Nicola Walker and Sanjeev Bhaskar) to solve to our screens later this year.

Here’s all you need to know about the forthcoming series 4 of Unforgotten.

When is Unforgotten series 4 on TV?

While no air date has been released yet, we were hoping to see Unforgotten back on our screens some time in 2020.

The new episodes began filming in January, however production had to be suspended in March as a result of the lockdown prompted by the COVID-19 pandemic.

"We were just over halfway through when we had to down tools," Bhaskar said in an interview with TalkSport in April.

"You shoot out of sequence so I'm in the strange position where I've arrested the person or persons 'wot done it', but I haven't actually met them yet - we haven't shot that scene.

"The challenge for me now when we do get back to filming is not to look three times as fat as in the scenes I've already shot."

What will happen in series 4?

As ever, we’ll see some seriously creepy cold cases resurface for the new episodes.

In the series opening, the team discover a dismembered body in a scrap metal yard that appears to have been stored in a domestic freezer for 30 years.

Helped by a distinctive Millwall Foootball Club tattoo, they’re able to identify the victim as a young man who went missing in 1990.

ITV

While it doesn’t take long to trace the owner of the freezer, the detectives soon discover that he recently died a lonely, isolated man, and had a drink-driving conviction for the same night the victim went missing.

Intriguingly, it turns out that there were four other passengers in the car that night, and over the course of the series we’ll meet Ram Sidhu and his wife Anna who are expecting their first baby together in London; Liz Baildon and her fiancée Janet who live in Cambridge; Fiona Grayson, her partner Geoff and their children in the Peak District; and Dean Barton and his wife Marnie who live in Rochester with their disabled son, Jack, and his younger sibling, Casper.

All in their late forties, their lives are looking good, until the mystery of the body comes back to haunt them and threatens to destroy everything they’ve built for themselves over the last 30 years.

Meanwhile, Cassie has her own problems to deal with – she’d decided to retire from the police force, but when she discovers that she will not get her full pension without completing her 30 years’ service, she is forced to return to work.

It’s bad news for her, but good news for viewers who will be looking forward to seeing more of her partnership with Sunny.

Series 1-3 of Unforgotten can be viewed now on Netflix.

Series 4 is due to air on ITV later in 2020.

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